Submission #1099261

#	Time	Username	Problem	Language	Result	Execution time	Memory
1099261		DangKhoizzzz	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	100 / 100	23 ms	6296 KiB

Main

#include <bits/stdc++.h>
#define ll long long

using namespace std;


const int maxn = 2e5 + 7;

int n , a[maxn] ;
ll precnt[maxn] , sufcnt[maxn];

void solve()
{
    cin >> n;
    for(int i = 1; i <= n; i++) cin >> a[i];

    for(int i = 1; i <= n; i++)
    {
        precnt[i] = precnt[i-1];

        if(a[i] <= a[i-1])
        {
            precnt[i] += a[i-1] - a[i] + 1;
        }
    }

    for(int i = n; i >= 1; i--)
    {
        sufcnt[i] = sufcnt[i+1];

        if(a[i] <= a[i+1])
        {
           sufcnt[i] += a[i+1] - a[i] + 1;
        }
    }

    ll ans = 1e18;

    for(int i = 1; i <= n; i++)
    {
        ans = min(ans , max(precnt[i] , sufcnt[i]));
    }

    cout << ans << '\n';
}


int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    solve();
    return 0;
}

• Subtask 1: 40 / 40
• Subtask 2: 60 / 60